/* ==========================================================================
   51吃瓜网网址 · 整站样式表
   报纸编辑风 · 黑白色调 · 暖白纸面背景
   ========================================================================== */

/* ==========================================================================
   1. Base —— 变量、重置、全局基础
   ========================================================================== */

:root {
  --color-ink: #111111;
  --color-paper: #f4f1ea;
  --color-line: #e5e0d6;
  --color-muted: #6b655c;
  --color-accent: #9a3b26;
  --color-white: #ffffff;

  --font-serif: "Songti SC", "SimSun", "Noto Serif SC", serif;
  --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;

  --container-width: 1200px;
  --container-padding: 0 24px;

  --text-hero: 34px;
  --text-h2: 24px;
  --text-h3: 18px;
  --text-body: 16px;
  --text-small: 15px;

  --line-height-body: 1.8;
  --line-height-heading: 1.4;

  --radius-sm: 4px;
  --radius-md: 8px;

  --space-section: 72px;
  --space-block: 40px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-body);
  line-height: var(--line-height-body);
  color: var(--color-ink);
  background-color: var(--color-paper);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--color-ink);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-accent);
}

ul,
ol {
  list-style: none;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-serif);
  line-height: var(--line-height-heading);
  font-weight: 700;
  color: var(--color-ink);
}

h1 {
  font-size: var(--text-hero);
}

h2 {
  font-size: var(--text-h2);
}

h3 {
  font-size: var(--text-h3);
}

p {
  margin-bottom: 1em;
}

p:last-child {
  margin-bottom: 0;
}

/* ==========================================================================
   2. Layout —— 容器、栅格、面包屑、页面骨架
   ========================================================================== */

.site-body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--color-paper);
}

.site-main {
  flex: 1 0 auto;
}

.home-main {
  width: 100%;
}

.inner-main {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--container-padding);
  padding-bottom: var(--space-section);
}

/* 面包屑 */
.breadcrumb {
  font-size: var(--text-small);
  color: var(--color-muted);
  margin-bottom: 24px;
  line-height: 1.6;
}

.breadcrumb a {
  color: var(--color-muted);
}

.breadcrumb a:hover {
  color: var(--color-accent);
}

.breadcrumb-sep {
  margin: 0 10px;
  color: var(--color-line);
}

.breadcrumb-current {
  color: var(--color-ink);
  font-weight: 500;
}

.breadcrumb-wrap {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--container-padding);
  padding-top: 20px;
  padding-bottom: 0;
}

.breadcrumb-wrap .breadcrumb {
  margin-bottom: 0;
}

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
}

.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin: 0 8px;
  color: var(--color-line);
}

/* 页面标题区 */
.page-header {
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 2px solid var(--color-ink);
}

.page-title {
  font-size: var(--text-hero);
  line-height: 1.3;
}

.page-heading {
  margin-bottom: var(--space-block);
}

.page-lead,
.page-intro {
  font-size: var(--text-body);
  color: var(--color-muted);
  max-width: 720px;
  line-height: var(--line-height-body);
}

/* 通用双栏布局 */
.page-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 48px;
  align-items: start;
}

.page-layout > .page-sidebar,
.page-layout > aside {
  min-width: 0;
}

.page-layout > .site-main,
.page-layout > .main-content {
  min-width: 0;
}

.layout-shell {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 48px;
  align-items: start;
}

.layout-shell > .main-content {
  min-width: 0;
}

.layout-shell > .sidebar-area {
  min-width: 0;
}

/* 侧栏在前 */
.sidebar-left {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 48px;
  align-items: start;
}

.sidebar-left > aside {
  min-width: 0;
}

.sidebar-left > .main-content,
.sidebar-left > .site-main {
  min-width: 0;
}

/* 面包屑在侧栏内部的场景 */
.sidebar-left .breadcrumb {
  margin-bottom: 20px;
}

/* 正文宽度保护 */
.sidebar-left .main-content,
.sidebar-left .site-main,
.page-layout .main-content,
.page-layout .site-main,
.layout-shell .main-content {
  min-width: 0;
  max-width: 100%;
}

/* ==========================================================================
   3. Components —— 页头、导航、页脚、按钮、卡片、列表等
   ========================================================================== */

/* ---------- 页头 ---------- */
.site-header {
  width: 100%;
  background-color: var(--color-paper);
  border-bottom: 1px solid var(--color-line);
}

.header-topbar {
  background-color: var(--color-ink);
  color: var(--color-paper);
  font-size: 13px;
  padding: 8px 0;
  text-align: center;
}

.topbar-text {
  margin: 0;
  color: var(--color-paper);
  font-size: 13px;
  letter-spacing: 0.02em;
}

.header-main {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.site-brand {
  flex-shrink: 0;
}

.brand-link {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-name {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-ink);
}

.brand-tagline {
  font-size: 12px;
  color: var(--color-muted);
  line-height: 1.4;
  letter-spacing: 0.04em;
}

/* ---------- 主导航 ---------- */
.main-nav {
  position: relative;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: block;
  padding: 10px 16px;
  font-size: var(--text-small);
  color: var(--color-ink);
  border-bottom: 2px solid transparent;
  line-height: 1.4;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.nav-link:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

.nav-link.is-current {
  color: var(--color-ink);
  border-bottom-color: var(--color-ink);
  font-weight: 600;
}

/* 汉堡按钮（默认隐藏） */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  cursor: pointer;
  padding: 0;
}

.nav-toggle-line {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--color-ink);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- 页脚 ---------- */
.site-footer {
  background-color: var(--color-ink);
  color: var(--color-paper);
  margin-top: auto;
}

.footer-layout {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px 24px 40px;
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
}

.footer-brand-name {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-paper);
  margin-bottom: 8px;
}

.footer-brand-tagline {
  font-size: 13px;
  color: rgba(244, 241, 234, 0.7);
  margin-bottom: 12px;
  letter-spacing: 0.03em;
}

.footer-brand-desc {
  font-size: 14px;
  color: rgba(244, 241, 234, 0.6);
  line-height: 1.7;
}

.footer-heading {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  color: var(--color-paper);
  margin-bottom: 16px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: rgba(244, 241, 234, 0.7);
  font-size: 14px;
  line-height: 1.6;
}

.footer-links a:hover {
  color: var(--color-paper);
}

.footer-bottom {
  border-top: 1px solid rgba(244, 241, 234, 0.15);
  padding: 20px 24px;
  text-align: center;
}

.copyright {
  font-size: 13px;
  color: rgba(244, 241, 234, 0.5);
  margin: 0;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: var(--text-small);
  font-weight: 600;
  line-height: 1.4;
  border: 1px solid var(--color-ink);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  min-height: 44px;
  text-align: center;
}

.btn-primary {
  background-color: var(--color-ink);
  color: var(--color-paper);
}

.btn-primary:hover {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-paper);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-ink);
}

.btn-outline:hover {
  background-color: var(--color-ink);
  color: var(--color-paper);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-ink);
  border-color: var(--color-line);
}

.btn-secondary:hover {
  border-color: var(--color-ink);
  background-color: var(--color-ink);
  color: var(--color-paper);
}

/* ---------- 卡片链接 ---------- */
.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  padding: 8px 0;
  min-height: 44px;
}

.card-link::after {
  content: "→";
  transition: transform 0.2s ease;
}

.card-link:hover::after {
  transform: translateX(4px);
}

/* ---------- 区块标题 ---------- */
.section-heading {
  margin-bottom: 36px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-line);
}

.section-title {
  font-size: var(--text-h2);
  margin-bottom: 8px;
}

.section-desc {
  font-size: var(--text-small);
  color: var(--color-muted);
  line-height: var(--line-height-body);
  max-width: 640px;
}

/* ---------- 相关链接 ---------- */
.related-links {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 24px;
  border-top: 1px solid var(--color-line);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  font-size: 14px;
}

.related-links-label {
  font-weight: 600;
  color: var(--color-muted);
}

.related-links-item {
  color: var(--color-ink);
  border-bottom: 1px solid var(--color-line);
  padding: 4px 0;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.related-links-item:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* ---------- 联系 CTA（内页通用） ---------- */
.contact-cta {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 48px 24px;
  border-top: 2px solid var(--color-ink);
  text-align: left;
}

.cta-title {
  font-size: var(--text-h2);
  margin-bottom: 12px;
}

.cta-text,
.cta-desc {
  font-size: var(--text-body);
  color: var(--color-muted);
  max-width: 640px;
  margin-bottom: 24px;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.cta-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: var(--text-small);
  font-weight: 600;
  border: 1px solid var(--color-ink);
  border-radius: var(--radius-sm);
  background-color: var(--color-ink);
  color: var(--color-paper);
  min-height: 44px;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.cta-button:hover {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-paper);
}

.cta-button-secondary {
  background-color: transparent;
  color: var(--color-ink);
}

.cta-button-secondary:hover {
  background-color: var(--color-ink);
  color: var(--color-paper);
}

.cta-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 28px;
  font-size: var(--text-small);
  font-weight: 600;
  border: 1px solid var(--color-ink);
  border-radius: var(--radius-sm);
  background-color: var(--color-ink);
  color: var(--color-paper);
  min-height: 44px;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.cta-link:hover {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-paper);
}

/* ==========================================================================
   4. Pages —— 首页及各内页模块
   ========================================================================== */

/* ==================== 首页 ==================== */

/* Hero */
.hero-section {
  border-bottom: 1px solid var(--color-line);
}

.hero-content {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 56px 24px;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: center;
}

.hero-title {
  font-size: 34px;
  line-height: 1.3;
  margin-bottom: 16px;
}

.hero-lead {
  font-family: var(--font-serif);
  font-size: 20px;
  color: var(--color-accent);
  margin-bottom: 12px;
  line-height: 1.5;
}

.hero-desc {
  font-size: var(--text-body);
  color: var(--color-muted);
  margin-bottom: 28px;
  max-width: 520px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.hero-figure {
  position: relative;
  border: 1px solid var(--color-line);
  background-color: var(--color-white);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.hero-image {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.hero-caption {
  font-size: 13px;
  color: var(--color-muted);
  padding: 12px 16px;
  border-top: 1px solid var(--color-line);
  background-color: var(--color-paper);
  margin: 0;
}

/* 服务能力索引 */
.service-index-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--space-section) 24px;
}

.service-index-layout {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 56px;
}

.service-intro-title {
  font-size: 20px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-line);
}

.service-intro-text {
  font-size: var(--text-small);
  color: var(--color-muted);
  line-height: var(--line-height-body);
  margin-bottom: 16px;
}

.service-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.service-item {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 24px;
  background-color: var(--color-white);
  display: flex;
  gap: 16px;
  align-items: flex-start;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.service-item:hover {
  border-color: var(--color-ink);
}

.service-number {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 700;
  color: var(--color-line);
  line-height: 1;
  flex-shrink: 0;
}

.service-item-title {
  font-size: 17px;
  margin-bottom: 8px;
}

.service-item-desc {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 12px;
}

.service-item-meta {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 4px;
}

.service-item-meta strong {
  color: var(--color-ink);
  font-weight: 600;
}

/* 行业场景摘要 */
.industry-summary-section {
  border-top: 1px solid var(--color-line);
  background-color: var(--color-white);
}

.industry-summary-section .section-heading {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--space-section) 24px 36px;
}

.industry-grid {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px var(--space-section);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.industry-card {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 28px;
  background-color: var(--color-paper);
  display: flex;
  flex-direction: column;
  transition: border-color 0.2s ease;
}

.industry-card:hover {
  border-color: var(--color-ink);
}

.industry-card-title {
  font-size: 18px;
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-line);
}

.industry-problem {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 12px;
}

.industry-solution {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-ink);
  margin-bottom: 16px;
  flex-grow: 1;
}

/* 交付体系摘要 */
.delivery-summary-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--space-section) 24px;
}

.delivery-layout {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 56px;
  align-items: start;
}

.stage-list {
  counter-reset: stage;
}

.stage-item {
  display: flex;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-line);
  align-items: flex-start;
}

.stage-item:first-child {
  padding-top: 0;
}

.stage-number {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  color: var(--color-line);
  line-height: 1.2;
  flex-shrink: 0;
  min-width: 40px;
}

.stage-body {
  flex: 1;
}

.stage-title {
  font-size: 17px;
  margin-bottom: 6px;
}

.stage-desc {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
}

.delivery-version {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-white);
  padding: 28px;
}

.version-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-line);
}

.version-number {
  display: inline-block;
  background-color: var(--color-ink);
  color: var(--color-paper);
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
}

.version-date {
  font-size: 13px;
  color: var(--color-muted);
  margin-bottom: 12px;
}

.version-desc {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 16px;
}

/* 公告摘要 */
.announcement-section {
  border-top: 1px solid var(--color-line);
  background-color: var(--color-white);
}

.announcement-section .section-heading {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--space-section) 24px 36px;
}

.announcement-list {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px var(--space-section);
}

.announcement-item {
  padding: 24px 0;
  border-bottom: 1px solid var(--color-line);
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 24px;
  align-items: start;
}

.announcement-item:first-child {
  padding-top: 0;
}

.announcement-date {
  font-size: 14px;
  color: var(--color-muted);
  font-family: var(--font-serif);
  line-height: 1.6;
}

.announcement-title {
  font-size: 18px;
  margin-bottom: 8px;
}

.announcement-excerpt {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 8px;
}

/* 品牌故事 */
.brand-story-section {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: var(--space-section) 24px;
}

.brand-story-layout {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 56px;
  align-items: center;
}

.brand-story-lead {
  font-family: var(--font-serif);
  font-size: 20px;
  line-height: 1.5;
  margin-bottom: 16px;
  color: var(--color-ink);
}

.brand-story-desc {
  font-size: var(--text-small);
  color: var(--color-muted);
  line-height: var(--line-height-body);
  margin-bottom: 16px;
}

.brand-story-figure {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-white);
}

.brand-story-image {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.brand-story-figure figcaption {
  font-size: 13px;
  color: var(--color-muted);
  padding: 12px 16px;
  border-top: 1px solid var(--color-line);
  margin: 0;
}

/* 首页 CTA */
.cta-section {
  background-color: var(--color-ink);
  color: var(--color-paper);
}

.cta-content {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 64px 24px;
  text-align: left;
}

.cta-content .cta-title {
  color: var(--color-paper);
}

.cta-content .cta-desc {
  color: rgba(244, 241, 234, 0.7);
}

.cta-content .btn-primary {
  background-color: var(--color-paper);
  color: var(--color-ink);
  border-color: var(--color-paper);
}

.cta-content .btn-primary:hover {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-paper);
}

.cta-content .btn-outline {
  border-color: rgba(244, 241, 234, 0.5);
  color: var(--color-paper);
}

.cta-content .btn-outline:hover {
  background-color: var(--color-paper);
  color: var(--color-ink);
}

/* ==================== 业务页 ==================== */

.page-business .page-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 48px;
  align-items: start;
}

/* 侧栏索引 */
.service-index-nav {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-white);
  padding: 24px;
  position: sticky;
  top: 24px;
}

.service-index-nav h2 {
  font-size: 18px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-line);
  margin-bottom: 12px;
}

.aside-desc {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 16px;
}

.anchor-list li {
  margin-bottom: 4px;
}

.anchor-list a {
  display: block;
  padding: 10px 12px;
  font-size: 14px;
  border-left: 2px solid transparent;
  color: var(--color-ink);
  line-height: 1.4;
}

.anchor-list a:hover {
  border-left-color: var(--color-accent);
  color: var(--color-accent);
  background-color: var(--color-paper);
}

.aside-note {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--color-line);
}

.aside-note p {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 8px;
}

.version-tag {
  display: inline-block;
  background-color: var(--color-ink);
  color: var(--color-paper);
  font-size: 12px;
  font-weight: 600;
  padding: 2px 10px;
  border-radius: var(--radius-sm);
  margin-bottom: 8px;
}

.aside-note-text {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.6;
}

/* 业务模块 */
.service-modules {
  min-width: 0;
}

.service-module {
  padding: 32px 0;
  border-bottom: 1px solid var(--color-line);
}

.service-module:first-child {
  padding-top: 0;
}

.module-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 16px;
}

.module-number {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 700;
  color: var(--color-line);
  line-height: 1;
}

.module-head h2 {
  font-size: 22px;
}

.module-intro {
  font-size: var(--text-small);
  color: var(--color-muted);
  line-height: var(--line-height-body);
  margin-bottom: 24px;
  max-width: 640px;
}

.module-content {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 32px;
  align-items: start;
}

.module-text h3 {
  font-size: 16px;
  margin-bottom: 8px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--color-line);
}

.module-text p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 16px;
}

.module-figure {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-white);
}

.module-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.module-figure figcaption {
  font-size: 13px;
  color: var(--color-muted);
  padding: 10px 14px;
  border-top: 1px solid var(--color-line);
  margin: 0;
}

.deliverable-box {
  margin-top: 24px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-white);
  padding: 20px 24px;
}

.deliverable-box h3 {
  font-size: 15px;
  margin-bottom: 12px;
}

.deliverable-list {
  list-style: none;
}

.deliverable-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  color: var(--color-ink);
  line-height: 1.7;
  margin-bottom: 8px;
}

.deliverable-list li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--color-accent);
}

/* 服务版本说明 */
.service-version-note {
  margin-top: 40px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-white);
  padding: 28px;
}

.service-version-note h2 {
  font-size: 18px;
  margin-bottom: 16px;
}

.version-info {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 24px;
}

.version-current {
  border-right: 1px solid var(--color-line);
  padding-right: 24px;
}

.version-current .version-tag {
  font-size: 16px;
  padding: 4px 14px;
}

.version-current .version-date {
  font-size: 13px;
  color: var(--color-muted);
  margin-top: 8px;
}

.version-summary {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 12px;
}

.version-history-link {
  font-size: 14px;
}

.version-history-link a {
  color: var(--color-accent);
  font-weight: 600;
  border-bottom: 1px solid var(--color-accent);
  padding-bottom: 2px;
}

.version-history-link a:hover {
  color: var(--color-ink);
  border-bottom-color: var(--color-ink);
}

/* ==================== 行业方案页 ==================== */

/* 方案索引 */
.industry-index {
  margin-bottom: 48px;
}

.index-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  border-bottom: 1px solid var(--color-line);
  padding-bottom: 20px;
}

.index-tab-item a {
  display: inline-flex;
  align-items: center;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-white);
  color: var(--color-ink);
  min-height: 44px;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.index-tab-item a:hover {
  border-color: var(--color-ink);
  background-color: var(--color-paper);
}

/* 方案组 */
.solution-block {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 40px;
  padding: 48px 0;
  border-bottom: 1px solid var(--color-line);
  align-items: start;
}

.solution-block:first-child {
  padding-top: 0;
}

.solution-heading {
  font-size: 24px;
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-ink);
}

.solution-abstract {
  font-size: var(--text-small);
  color: var(--color-muted);
  line-height: var(--line-height-body);
  margin-bottom: 24px;
}

.sub-heading {
  font-size: 16px;
  margin-top: 20px;
  margin-bottom: 10px;
  color: var(--color-ink);
}

.solution-copy {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 12px;
}

.solution-list {
  list-style: none;
  margin-bottom: 12px;
}

.solution-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  color: var(--color-ink);
  line-height: 1.7;
  margin-bottom: 8px;
}

.solution-list li::before {
  content: "·";
  position: absolute;
  left: 4px;
  font-size: 20px;
  line-height: 1;
  color: var(--color-accent);
}

.solution-figure {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-white);
  position: sticky;
  top: 24px;
}

.solution-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.solution-figure figcaption {
  font-size: 13px;
  color: var(--color-muted);
  padding: 10px 14px;
  border-top: 1px solid var(--color-line);
  margin: 0;
}

/* 方案选择说明 */
.selection-guide {
  padding: 48px 0;
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-bottom: 24px;
}

.guide-item {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-white);
  padding: 24px;
}

.guide-heading {
  font-size: 16px;
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-line);
}

.guide-copy {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
}

.guide-note {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  border-left: 3px solid var(--color-accent);
  padding-left: 16px;
}

/* ==================== 交付体系页 ==================== */

.page-delivery .page-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 48px;
  align-items: start;
}

.page-sidebar {
  position: sticky;
  top: 24px;
}

.sidebar-inner {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-white);
  padding: 24px;
}

.sidebar-title {
  font-size: 18px;
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-line);
}

.sidebar-intro {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 16px;
}

.version-list {
  list-style: none;
}

.version-item {
  margin-bottom: 8px;
}

.version-link {
  display: block;
  padding: 12px 16px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.version-link:hover {
  border-color: var(--color-ink);
}

.version-item.is-current .version-link {
  border-color: var(--color-ink);
  background-color: var(--color-paper);
}

.version-number {
  display: block;
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
}

.version-date {
  display: block;
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.5;
}

.sidebar-note {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--color-line);
}

.note-text {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.6;
}

/* 交付阶段列表 */
.stage-list {
  margin-bottom: 48px;
}

.stage-items {
  counter-reset: stage;
}

.stage-item {
  display: flex;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-line);
  align-items: flex-start;
}

.stage-item:first-child {
  padding-top: 0;
}

.stage-number {
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 700;
  color: var(--color-line);
  line-height: 1.2;
  flex-shrink: 0;
  min-width: 48px;
}

.stage-content {
  flex: 1;
  min-width: 0;
}

.stage-name {
  font-size: 18px;
  margin-bottom: 6px;
}

.stage-text {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
}

/* 交付物表格 */
.deliverable-table-section {
  margin-bottom: 48px;
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-white);
}

.deliverable-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.deliverable-table thead th {
  background-color: var(--color-ink);
  color: var(--color-paper);
  font-weight: 600;
  padding: 14px 16px;
  text-align: left;
  white-space: nowrap;
}

.deliverable-table tbody td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--color-line);
  vertical-align: top;
  line-height: 1.7;
  color: var(--color-ink);
}

.deliverable-table tbody tr:last-child td {
  border-bottom: none;
}

.deliverable-table tbody tr:hover {
  background-color: var(--color-paper);
}

/* 变更记录 */
.change-log-section {
  margin-bottom: 48px;
}

.change-log-list {
  list-style: none;
}

.change-log-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--color-line);
}

.change-log-item:first-child {
  padding-top: 0;
}

.change-log-head {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 8px;
}

.change-version {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--color-ink);
}

.change-date {
  font-size: 13px;
  color: var(--color-muted);
}

.change-desc {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
}

/* 验收清单 */
.acceptance-checklist {
  margin-bottom: 48px;
}

.checklist-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.checklist-item {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-white);
  padding: 16px 20px;
}

.check-label {
  display: block;
  font-weight: 600;
  font-size: 15px;
  margin-bottom: 4px;
}

.check-detail {
  display: block;
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.6;
}

.delivery-figure {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-white);
}

.delivery-image {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.figure-caption {
  font-size: 13px;
  color: var(--color-muted);
  padding: 10px 14px;
  border-top: 1px solid var(--color-line);
  margin: 0;
}

/* ==================== 洞察页 ==================== */

.page-insights .layout-shell {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 48px;
  align-items: start;
}

/* 公告列表 */
.announcement-item {
  padding: 28px 0;
  border-bottom: 1px solid var(--color-line);
}

.announcement-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 8px;
}

.announcement-date {
  font-size: 14px;
  color: var(--color-muted);
  font-family: var(--font-serif);
}

.announcement-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-sm);
  padding: 2px 8px;
}

.announcement-title {
  font-size: 20px;
  margin-bottom: 10px;
}

.announcement-summary {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 12px;
}

.announcement-body {
  font-size: 14px;
  color: var(--color-ink);
  line-height: 1.8;
  margin-bottom: 12px;
}

.announcement-body p {
  margin-bottom: 12px;
}

.announcement-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.announcement-links a {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-accent);
  padding-bottom: 2px;
}

.announcement-links a:hover {
  color: var(--color-ink);
  border-bottom-color: var(--color-ink);
}

/* 侧边栏 */
.sidebar-area {
  min-width: 0;
}

.related-announcements,
.topic-index {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-white);
  padding: 24px;
  margin-bottom: 24px;
}

.sidebar-title {
  font-size: 18px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-line);
}

.sidebar-list {
  list-style: none;
}

.sidebar-item {
  padding: 8px 0;
  border-bottom: 1px solid var(--color-line);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
}

.sidebar-item:last-child {
  border-bottom: none;
}

.sidebar-item a {
  font-size: 14px;
  line-height: 1.5;
  flex: 1;
}

.sidebar-item a:hover {
  color: var(--color-accent);
}

.sidebar-date {
  font-size: 12px;
  color: var(--color-muted);
  flex-shrink: 0;
}

.sidebar-figure {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-white);
}

.sidebar-figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.sidebar-figure figcaption {
  font-size: 13px;
  color: var(--color-muted);
  padding: 10px 14px;
  border-top: 1px solid var(--color-line);
  margin: 0;
}

/* ==================== 关于页 ==================== */

.page-about .layout-shell {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 48px;
  align-items: start;
}

/* 侧栏说明 */
.sidebar-note {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-white);
  padding: 24px;
  position: sticky;
  top: 24px;
}

.sidebar-note h2 {
  font-size: 18px;
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-line);
}

.sidebar-note p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
}

/* 定位说明 */
.positioning-text {
  margin-bottom: 48px;
}

.positioning-text .main-content h2 {
  font-size: 20px;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-line);
}

.positioning-text .main-content p {
  font-size: var(--text-small);
  color: var(--color-muted);
  line-height: var(--line-height-body);
  margin-bottom: 16px;
}

/* 工作原则 */
.principles-list {
  margin-bottom: 48px;
}

.principles-list > h2 {
  font-size: 22px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-ink);
}

.principle-items {
  counter-reset: principle;
}

.principle-items li {
  display: flex;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-line);
  align-items: flex-start;
}

.principle-items li::before {
  counter-increment: principle;
  content: counter(principle, decimal-leading-zero);
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 700;
  color: var(--color-line);
  line-height: 1.2;
  flex-shrink: 0;
}

.principle-items h3 {
  font-size: 18px;
  margin-bottom: 6px;
}

.principle-items p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
}

/* 图片块 */
.image-block {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  background-color: var(--color-white);
  margin-bottom: 48px;
}

.image-block img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.image-block figcaption {
  font-size: 13px;
  color: var(--color-muted);
  padding: 12px 16px;
  border-top: 1px solid var(--color-line);
  margin: 0;
}

/* 合作边界 */
.boundary-list {
  margin-bottom: 48px;
}

.boundary-list > h2 {
  font-size: 22px;
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-ink);
}

.boundary-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.boundary-card {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-white);
  padding: 24px;
}

.boundary-card h3 {
  font-size: 16px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-line);
}

.boundary-card ul {
  list-style: none;
}

.boundary-card li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 8px;
}

.boundary-card li::before {
  content: "·";
  position: absolute;
  left: 4px;
  font-size: 18px;
  line-height: 1;
  color: var(--color-accent);
}

/* ==================== 联系页 ==================== */

.requirements-checklist,
.cooperation-process,
.faq {
  margin-bottom: 48px;
}

.section-number {
  display: inline-block;
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--color-accent);
  margin-right: 8px;
}

.requirements-checklist h2,
.cooperation-process h2,
.faq h2 {
  font-size: 22px;
  margin-bottom: 12px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--color-ink);
}

.checklist {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.checklist-item {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-white);
  padding: 20px 24px;
}

.checklist-item h3 {
  font-size: 16px;
  margin-bottom: 8px;
}

.checklist-item p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin: 0;
}

.process-list {
  counter-reset: process;
  list-style: none;
}

.process-item {
  display: flex;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-line);
  align-items: flex-start;
}

.process-item::before {
  counter-increment: process;
  content: counter(process, decimal-leading-zero);
  font-family: var(--font-serif);
  font-size: 28px;
  font-weight: 700;
  color: var(--color-line);
  line-height: 1.2;
  flex-shrink: 0;
}

.process-item h3 {
  font-size: 18px;
  margin-bottom: 6px;
}

.process-item p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
}

/* FAQ */
.faq-item {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background-color: var(--color-white);
  margin-bottom: 12px;
}

.faq-item summary {
  cursor: pointer;
  padding: 16px 20px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
  position: relative;
  padding-right: 44px;
  list-style: none;
  min-height: 44px;
  display: flex;
  align-items: center;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 22px;
  font-weight: 400;
  color: var(--color-muted);
  transition: transform 0.2s ease;
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-item p {
  padding: 0 20px 16px;
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.7;
  margin: 0;
  border-top: 1px solid var(--color-line);
  padding-top: 16px;
}

/* 合作前说明 */
.contact-flow-text {
  margin-bottom: 48px;
  padding: 32px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  background-color: var(--color-white);
}

.contact-flow-text h2 {
  font-size: 20px;
  margin-bottom: 16px;
}

.contact-flow-text p {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.8;
  margin-bottom: 16px;
}

.contact-image-block {
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-top: 24px;
}

.contact-image-block img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.contact-image-block figcaption {
  font-size: 13px;
  color: var(--color-muted);
  padding: 10px 14px;
  border-top: 1px solid var(--color-line);
  margin: 0;
}

/* ==================== 404 页 ==================== */

.error-main {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 60vh;
  padding: 48px 24px;
}

.error-panel {
  max-width: 600px;
  text-align: left;
  border: 2px solid var(--color-ink);
  border-radius: var(--radius-md);
  background-color: var(--color-white);
  padding: 48px;
}

.error-code {
  font-family: var(--font-serif);
  font-size: 64px;
  font-weight: 700;
  color: var(--color-line);
  line-height: 1;
  margin-bottom: 16px;
}

.error-title {
  font-size: 24px;
  margin-bottom: 16px;
}

.error-desc {
  font-size: 15px;
  color: var(--color-muted);
  line-height: 1.7;
  margin-bottom: 12px;
}

.error-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.error-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  border: 1px solid var(--color-ink);
  border-radius: var(--radius-sm);
  background-color: var(--color-ink);
  color: var(--color-paper);
  min-height: 44px;
  transition: background-color 0.2s ease;
}

.error-link:hover {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-paper);
}

/* ==========================================================================
   5. Responsive —— 响应式断点
   ========================================================================== */

/* 平板及以下 */
@media (max-width: 1024px) {
  .hero-content {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .service-index-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .delivery-layout {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .brand-story-layout {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-layout {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .page-business .page-layout,
  .page-delivery .page-layout,
  .page-about .layout-shell {
    grid-template-columns: 220px 1fr;
    gap: 32px;
  }

  .page-insights .layout-shell {
    grid-template-columns: 1fr 260px;
    gap: 32px;
  }

  .module-content {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .solution-block {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .solution-figure {
    position: static;
  }
}

/* 移动端断点 */
@media (max-width: 768px) {
  :root {
    --space-section: 48px;
    --space-block: 32px;
  }

  h1 {
    font-size: 28px;
  }

  h2 {
    font-size: 20px;
  }

  h3 {
    font-size: 16px;
  }

  .container-padding {
    padding: 0 16px;
  }

  /* 页头 */
  .header-main {
    padding: 12px 16px;
  }

  .brand-name {
    font-size: 20px;
  }

  .nav-toggle {
    display: flex;
  }

  .nav-list {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    right: 0;
    background-color: var(--color-paper);
    border: 1px solid var(--color-line);
    border-radius: var(--radius-md);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
    padding: 8px;
    z-index: 100;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .nav-list.is-open {
    display: flex;
  }

  .nav-item {
    width: 100%;
  }

  .nav-link {
    padding: 14px 16px;
    border-bottom: 1px solid var(--color-line);
    border-left: 2px solid transparent;
    min-height: 44px;
    display: flex;
    align-items: center;
  }

  .nav-link.is-current {
    border-left-color: var(--color-accent);
    border-bottom-color: var(--color-line);
  }

  /* 面包屑 */
  .breadcrumb-wrap {
    padding: 16px 16px 0;
  }

  .breadcrumb {
    font-size: 13px;
    margin-bottom: 16px;
  }

  /* 页面标题 */
  .page-header {
    margin-bottom: 16px;
    padding-bottom: 16px;
  }

  .page-title {
    font-size: 24px;
  }

  .page-lead,
  .page-intro {
    font-size: 15px;
  }

  /* 内页容器 */
  .inner-main {
    padding: 0 16px 48px;
  }

  /* 布局切换为单列 */
  .page-layout,
  .layout-shell,
  .sidebar-left {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .page-business .page-layout,
  .page-delivery .page-layout,
  .page-about .layout-shell,
  .page-insights .layout-shell {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  /* 侧栏在正文之后 */
  .page-layout > aside,
  .page-layout > .page-sidebar,
  .layout-shell > .sidebar-area,
  .sidebar-left > aside {
    order: 2;
  }

  .page-layout > .site-main,
  .page-layout > .main-content,
  .layout-shell > .main-content,
  .sidebar-left > .main-content,
  .sidebar-left > .site-main {
    order: 1;
  }

  .service-index-nav,
  .page-sidebar,
  .sidebar-note {
    position: static;
  }

  /* 首页 Hero */
  .hero-content {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 40px 16px;
  }

  .hero-title {
    font-size: 28px;
  }

  .hero-lead {
    font-size: 18px;
  }

  /* 首页区块 */
  .service-index-section,
  .delivery-summary-section,
  .brand-story-section {
    padding: 48px 16px;
  }

  .industry-summary-section .section-heading {
    padding: 48px 16px 24px;
  }

  .industry-grid {
    grid-template-columns: 1fr;
    gap: 16px;
    padding: 0 16px 48px;
  }

  .service-list {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .service-item {
    padding: 20px;
  }

  .announcement-section .section-heading {
    padding: 48px 16px 24px;
  }

  .announcement-list {
    padding: 0 16px 48px;
  }

  .announcement-item {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .cta-content {
    padding: 48px 16px;
  }

  .cta-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .cta-actions .btn {
    width: 100%;
  }

  /* 页脚 */
  .footer-layout {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 40px 16px 24px;
  }

  .footer-bottom {
    padding: 16px;
  }

  /* 业务页 */
  .module-content {
    grid-template-columns: 1fr;
  }

  .module-figure {
    margin-top: 16px;
  }

  .version-info {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .version-current {
    border-right: none;
    border-bottom: 1px solid var(--color-line);
    padding-right: 0;
    padding-bottom: 16px;
  }

  /* 行业方案 */
  .index-tabs {
    flex-direction: column;
    align-items: stretch;
  }

  .index-tab-item a {
    width: 100%;
    justify-content: center;
  }

  .solution-block {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 32px 0;
  }

  .solution-heading {
    font-size: 20px;
  }

  .guide-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* 交付页 */
  .deliverable-table thead th,
  .deliverable-table tbody td {
    padding: 10px 12px;
    font-size: 13px;
  }

  .checklist-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  /* 洞察页 */
  .announcement-meta {
    flex-wrap: wrap;
  }

  .announcement-title {
    font-size: 18px;
  }

  /* 关于页 */
  .boundary-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .principle-items li {
    gap: 16px;
  }

  /* 联系页 */
  .checklist {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .process-item {
    gap: 16px;
  }

  .contact-flow-text {
    padding: 24px;
  }

  /* 404 */
  .error-panel {
    padding: 32px 24px;
  }

  .error-code {
    font-size: 48px;
  }

  .error-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .error-link {
    width: 100%;
  }

  /* 相关链接 */
  .related-links {
    padding: 16px;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .related-links-item {
    min-height: 40px;
  }
}

/* 超小屏 */
@media (max-width: 390px) {
  .brand-name {
    font-size: 18px;
  }

  .brand-tagline {
    font-size: 11px;
  }

  .hero-title {
    font-size: 24px;
  }

  .hero-lead {
    font-size: 16px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn {
    width: 100%;
  }

  .service-number {
    font-size: 24px;
  }

  .stage-number {
    font-size: 22px;
    min-width: 36px;
  }

  .principle-items li::before {
    font-size: 24px;
  }

  .process-item::before {
    font-size: 24px;
  }

  .deliverable-table {
    font-size: 12px;
  }

  .deliverable-table thead th,
  .deliverable-table tbody td {
    padding: 8px 10px;
  }
}